98 15ULLETIN o6, UNrrp]D 8TATES NATIONAL MUSEUM. 



ill the former is relatively longer and ii;irrower ; the iiiteriiiiixiUaries are 

 much narrower; the brain-case is narrower at the orbits; and the tem- 

 poral tbssiii are smaller. The teeth are more numerous and the skull is 

 much lighter in all its parts. The skulls of L. clattculu.s, as alreiuly 

 stated, appear to belong to a smaller species than L. obli<pd(lem, and 

 are inucli lighter. The rostrum is relatively broader than in L. obliqui- 

 detis as is also the brain-case at the orbits, and at the posterior margin 

 of the temporal fossa3. These fossa?, although of about the same length 

 as those of L. obliquidens, are more depressed. 



In the 3'Ounger specimen of the species under consideration the teeth 

 have been reset, and the number can not therefore be relied upon. In 

 the adult skull, No. 19G2, the teeth in the superior maxillary number 

 32 on each side ; in the mandible, 29 on each side. They are conical 

 and acute and lean strongly outward. 



The color of L. obliquidens has been recorded both by Captain Scam- 

 mon and Mr. Dall. The former describes it as follows: 



In point of color it is green isli-black on the upper snrfjice, lightened on tlie sides 

 with broad longitndinal stripes of white, gray, and dull black, which in most exam- 

 ples run into each other, but below it is of a pearly or snowy white. The posterior 

 edge of the dorsal tin is tipped with dull white or gray, and sometimes the llukes are 

 marked in the same mauuer.* 



In another part of the same work Mr. Dall describes the color as 

 follows : 



The animal is rather thick iu proportion to its length ; black above, with a strongly 

 falcate dorsal. Below, white, to the edge of the patch passing from the lower lip 

 below the pectorals and terminating a short distance behind the vent. A broad gray 

 smouch on each side above the line of the black color, and interrupted about the 

 middle of the animal on each side; the edges of the gray are ill-defined. The pos- 

 terior edges of the pectorals and dorsal are also grayish. t 



From these descriptions and the figures given by Scammou it would 

 apjiear that the coloration of X. obliquidens differs somewhat from both 

 of the well-known species L. acutus and L. (dbirosfris, for in the last- 

 named the white of the belly extends upon the upper lip, and in L. 

 acutus the light color of sides occupies only an area rather high up and 

 back of the dorsal fin. 



Captain Scammon gives to this species a very wide range, but does 

 not state localities. Mr. Dall, however, states that the specimens de- 

 scribed by him were taken at Monterey, IS'ovember 20, 1872. Dr. Gill's 

 types (Nos. 19G1-03) were obtained on the coast of California by Lieut. 

 W. P. Trowbridge. The skeleton described above (No, 14329) was also 

 obtained on the coast of California, but no particular localities are given 

 in either instance. A defective cranium (No. 3123) is from Puget Sound. 



* Scammon, Marine Mammalia, 1874, 98. 



tDall in Scammon's Marine Mammalia, 1874, 293. 



